Question 647 of 1,621
ANS-C01 Network Implementation Practice Question
A company is designing a VPC with multiple subnets for a three-tier application. They need to ensure that the database tier (private subnet) can be accessed only by the application tier (private subnet) and that no other resources in the VPC can access the database. Which TWO security mechanisms should be used together to achieve this? (Choose TWO.)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Security groups
Options C (Security groups) and D (Network ACLs) are correct. Security groups act as stateful firewalls at the instance level, allowing traffic from the application tier to the database instances. Network ACLs provide stateless filtering at the subnet level, restricting inbound traffic to the database subnet exclusively from the application subnet. Together, they enforce the required access control. Option A is incorrect because route tables control network routing, not traffic filtering. Option B (VPC Flow Logs) is for monitoring network traffic, not access control. Option E (IAM policies) manage permissions for AWS API calls, not network traffic.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Route tables
Why it's wrong here
Incorrect; route tables determine traffic paths, not allow/deny decisions.
- ✗
VPC Flow Logs
Why it's wrong here
Incorrect; Flow Logs capture traffic information but do not control access.
- ✓
Security groups
Why this is correct
Correct; security groups act as virtual firewalls at the instance level.
- ✓
Network ACLs
Why this is correct
Correct; NACLs can allow or deny traffic at the subnet level.
- ✗
IAM policies attached to the database instances
Why it's wrong here
Incorrect; IAM controls API access, not network traffic.
Visual reference
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Last reviewed: Jun 20, 2026
This ANS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ANS-C01 exam.
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